sh: convert kexec crash kernel management to LMB.

This migrates the crash kernel handling off of bootmem and over to LMB.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 50 insertions, 1 deletions

diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 7672141c841b..f0f049caa6e2 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -8,7 +8,6 @@
  * This source code is licensed under the GNU General Public License,
  * Version 2.  See the file COPYING for more details.
  */
-
 #include <linux/mm.h>
 #include <linux/kexec.h>
 #include <linux/delay.h>
@@ -16,6 +15,7 @@
 #include <linux/numa.h>
 #include <linux/ftrace.h>
 #include <linux/suspend.h>
+#include <linux/lmb.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
@@ -148,3 +148,52 @@ void arch_crash_save_vmcoreinfo(void)
         VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 #endif
 }
+
+void __init reserve_crashkernel(void)
+{
+        unsigned long long crash_size, crash_base;
+        int ret;
+
+        /* this is necessary because of lmb_phys_mem_size() */
+        lmb_analyze();
+
+        ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+                        &crash_size, &crash_base);
+        if (ret == 0 && crash_size > 0) {
+                crashk_res.start = crash_base;
+                crashk_res.end = crash_base + crash_size - 1;
+        }
+
+        if (crashk_res.end == crashk_res.start)
+                goto disable;
+
+        crash_size = PAGE_ALIGN(crashk_res.end - crashk_res.start + 1);
+        if (!crashk_res.start) {
+                crashk_res.start = lmb_alloc(crash_size, PAGE_SIZE);
+                if (!crashk_res.start) {
+                        pr_err("crashkernel allocation failed\n");
+                        goto disable;
+                }
+        } else {
+                ret = lmb_reserve(crashk_res.start, crash_size);
+                if (unlikely(ret < 0)) {
+                        pr_err("crashkernel reservation failed - "
+                               "memory is in use\n");
+                        goto disable;
+                }
+        }
+
+        pr_info("Reserving %ldMB of memory at %ldMB "
+                "for crashkernel (System RAM: %ldMB)\n",
+                (unsigned long)(crash_size >> 20),
+                (unsigned long)(crashk_res.start >> 20),
+                (unsigned long)(lmb_phys_mem_size() >> 20));
+
+        crashk_res.end = crashk_res.start + crash_size - 1;
+        insert_resource(&iomem_resource, &crashk_res);
+
+        return;
+
+disable:
+        crashk_res.start = crashk_res.end = 0;
+}